ledovi Stainless Steel Vacuum Wine Stopper WS08 - Pump Inside - Keep Your Best Wine Fresh Original Listing on Amazon - Top Quality Item/Detailed User Guide/Easy-open Eco Packaging - EASY & EFFICIENT - EASIEST several 'PUMPS' with palm removes air from the wine bottle and creates an airtight vacuum that preserves wine for up to two weeks, prevents the oxidation process that is responsible for the deterioration of wine. SIMPLE FITTING design makes it suitable for all 750ml wine bottles and champagne with 18mm inner top diameter. A lower button position(1/2" working lowest, 1" initial) on the stopper would indicate the airtight vacuum has been established, air cant get in and wine wont break out. Saving wine has never been easier. PREMIUM stainless steel shell is highly durable for years perfect use. 30 days money back guarantee. Add to cart for much better easier wine saving!